Broccoli waste as a food ingredient: nutrition and health
What it found
Broccoli stems and leaves, often thrown away, are rich in fibre, protein, vitamins and plant compounds.
Lab and animal studies suggest possible health benefits, but human trials are lacking.
What they found
Animal and lab studies
Antioxidant effects in animals
In rats given a kidney-damaging drug, broccoli leaf phenolic extracts reduced lipid peroxidation and restored glutathione and superoxide dismutase levels in kidney and liver.
Anti-inflammatory effects in animals
In mice, a diet with 10% broccoli stem fibre reduced liver inflammation markers. Broccoli leaf extract also lowered inflammatory markers in rats with kidney and liver toxicity.
Blood sugar and lipid effects
In obese mice, broccoli leaf sulforaphane extracts lowered blood glucose and serum lipids. In hamsters, broccoli leaf and stem peptides reduced total cholesterol and LDL cholesterol.
Cancer cell studies
In lab tests, broccoli leaf extracts slowed the growth of human lung and colon cancer cells. Purified polysaccharides from stems reduced the viability of liver, cervical and breast cancer cells.
Studies in people and animals
Safety and pesticide residues
Pesticide residues on leaves can be higher than on florets but degrade over time. A 21-day mouse study found no toxic effects on liver or kidneys from 6.7% broccoli waste flour in the diet.
Other findings
Rich in fibre and protein
Broccoli stems and leaves contain carbohydrates (over 60% of dry weight) and protein (about 25% of dry weight). The fibre is mostly insoluble, which can help with digestion.
Vitamins and plant compounds
Leaves have more vitamin C, vitamin K1 and tocopherols than florets. They also contain glucosinolates and phenolic compounds, which are linked to antioxidant and anti-inflammatory effects.
What the authors conclude
- They conclude that broccoli waste, especially leaves and stems, is a promising source of nutrients and bioactive compounds for food applications.
- They advise that further clinical trials are needed to confirm the health benefits and long-term safety in humans.
- They recommend optimising processing methods and incorporation levels to maintain sensory quality and bioactive content.
How it was done
Broccoli waste, mainly stems and leaves discarded during processing, is an underused resource. The authors wanted to review its nutritional composition and potential as a functional food ingredient.
They reviewed published studies on the nutritional content, bioactive compounds, processing methods, safety and food applications of broccoli stems and leaves.
What it can’t tell you
- Most health effects were seen in lab tests or animals, so they may not apply to people.
- There are no human trials on the anti-cancer or metabolic effects of broccoli waste.
- The review cannot show that eating broccoli waste causes any specific health outcome in people.
Who paid
- Conflicts
- Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
- Authors work at
- China Agricultural University, China; Institute of Vegetables and Flowers, China
The paper
- Title
- Valorization of broccoli waste: Unlocking its potential as a functional food ingredient for sustainable nutrition
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Full text
- Cite
- Wang Q, Zhao Y, Zhang W, Deng J, Yang H (2026). Valorization of broccoli waste: Unlocking its potential as a functional food ingredient for sustainable nutrition. Journal of advanced research. doi:10.1016/j.jare.2025.07.050Free full textPubMed 40749793DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error